After the great fire of Rome in 64 CE, Emperor Nero built an immense palace landscape across parts of the Palatine, Esquiline, and Caelian hills. Called the Domus Aurea, or Golden House, it incorporated gardens, pavilions, dining rooms, baths, fountains, and an artificial lake. Ancient authors presented its luxury as evidence of tyranny, but their hostile accounts must be read alongside archaeology. Architects Severus and Celer used concrete vaulting, controlled light, water, and rotating or moving elements to create an experiential residence rather than one continuous conventional palace enclosed by a single wall.

The surviving Esquiline pavilion contained reception and entertainment rooms arranged around an octagonal hall. Marble revetment, colored stone, stucco, gilding, and fresco covered surfaces. Painters employed the delicate architectural, vegetal, mythological, and fantastic motifs later classified as Roman Fourth Style. The building's name reflects this brilliance more than walls made literally of gold. Nero's lake occupied the valley where the Colosseum would later rise. A colossal statue stood nearby, while terraces and views connected interior spectacle to a reshaped imperial landscape at the heart of Rome.

Nero's death in 68 allowed later emperors to dismantle the political meaning of his residence. Vespasian returned the lake area to public spectacle by building the Flavian Amphitheater. Titus created baths over part of the palace, and Trajan's architect Apollodorus of Damascus used the Esquiline pavilion as a foundation for larger baths beginning in the early second century. Workers stripped valuable marble, filled rooms and openings with earth, and built above them. Burial destroyed the palace's function but stabilized many vaults and protected paintings from ordinary exposure for centuries.

Renaissance visitors entered the buried chambers from above and mistook them for natural grottos. Artists including Raphael and Pinturicchio studied and copied the decoration; the term grotesque derives from these grotto-like discoveries. Excavation gradually cleared spaces, but removing the protective earth changed humidity and loading, allowing water, roots, salts, microorganisms, and structural movement to threaten ceilings and paint. Modern projects have reintroduced controlled support, drainage, monitoring, and conservation. The famous octagonal room is ancient fabric, while walkways, lighting, protective systems, and multimedia interpretation are modern necessities.

The Domus Aurea is managed by the Parco archeologico del Colosseo and generally visited through scheduled guided routes because conservation remains active. What survives is only part of Nero's complex, chiefly subterranean rooms beneath the Baths of Trajan; gardens, lake, furnishings, marble surfaces, and many pavilions are lost. The structure is not a reconstructed Golden House, and its current darkness reverses the bright environment Nero's guests experienced. Its importance comes from innovative Roman design, the political erasure that preserved it, its influence on Renaissance ornament, and the difficult modern task of conserving an underground palace never intended to be underground.